A MONOGRAPH OF THE EXISTING CRINOIDS 253 



Challenger station 210; off Panglao and Siquijor Islands (lat. 9°26' N., long. 

 123°45' E.); 685 meters; bottom temperature 12.26° C; blue mud; January 25, 1875 

 [P. H. Carpenter, 1888; Hamann, 1907; A. H. Clark, 1907, 1908, 1909, 1911, 1912, 

 1913, 1918, 1921; Gislen, 1928, 1934; Hartlaub, 1912] (1, B. M.). 



Albatross station 5536; between Negros and Siquijor; Apo Island (C.) bearing 

 S. 26° W., 11.8 miles distant (lat. 9°15'45" N., long. 123°22'00" E.); 510 meters; 

 bottom temperature 11.94° C; green mud; August 19, 1909 [A. H. Clark, 1911] (1, 

 U.S.N.M., 35703). 



Albatross station 5523; off northern Mindanao; Point Tagolo Light bearing S. 48° 

 W., 6.7 miles distant (lat. 8°48'44" N., long. 123°27'35" E.); no depth or temperature 

 given; August 10, 1909 [A. H. Clark, 1911, 1912, 1916, 1918; Gislen, 1934] (2, U.S.N .M., 

 27504 [type], 36001). 



Albatross station 5510; in the vicinity of northern Mindanao; Camp Overton Light 

 bearing S. 68° E., 9.1 miles distant (lat. 8°16'00" N., long. 124°03'50" E.); 773 meters; 

 bottom temperature 11.66° C; gray mud and fine sand; August 7, 1909 [A. H. Clark, 

 1911] (3, U.S.N.M., 35718). 



Menado Bay, northern Celebes (lat. 1°31' N., long. 124°47' E.); 457 meters; 

 Captain Christiansen, Great Northern Telegraph Company, March 12, 1913 (1, CM.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 51; 348 meters; 

 mud; May 7, 1922 (1, CM.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 52; 252 meters; 

 mud; May 7, 1922 (1, U.S.N.M., E. 3152). 



Geographical range. — From southern Luzon, Philippines, southward to the Kei 

 Islands. 



Bathymetrical range. — From 252 to 773 meters. 



Thermal range.— From 8.55° to 13.44° C; the average of seven records is 11.42° C 



History. — Antedon distincta was described and figured by Dr. P. Herbert Carpenter 

 in his report on the comatulids of the Challenger Expedition published in 1888, on the 

 basis of a specimen from station 210. It was listed by Dr. Otto Hamann in 1907, 

 and in the same year in my first revision of the old genus Antedon it was transferred 

 to the new genus Charitometra. 



In 1908 I described Charitometra smithi from a specimen from Albatross station 

 5123, at the same time recording other specimens from stations 5116 and 5198. On 

 the establishment of the new genus Pachylometra in 1909 both distincta and smithi 

 were transferred to it. In 1911 in a paper on a collection of crinoids made by the 

 Albatross in the Philippines I recorded and gave notes on four specimens of Pachylometra 

 distincta from station 5510 and one, on which the genital pinnules bore eggs, from 

 station 5536; I remarked that the most striking characteristic of this species is its 

 slenderness, especially the slenderness of the cirri, the long proximal segments of 

 which are twice as long as broad. I briefly described Pachylometra selene from a 

 specimen from station 5523, and recorded and gave notes on 3 specimens of Pachylo- 

 metra smithi from station 5282, 22 from station 5348, and remarked that in the original 

 description of this species the arm length was given as 60 mm., an error for 160 mm. 

 In my memoir on the crinoids of the Indian Ocean published in 1912 Pachylometra 

 distincta, P. smithi, and P. selene were listed and their synonymies and ranges were 

 given. In my paper on the crinoids of the British Museum published in 1913 I remarked 



